Screw reverse-gear for engine-valves.



W- A. AUST|N & S. S. LAWSON. SCREW REVERSE GEAR FOR ENGINE VALVES.

APPLICATION FILED DEC. I, 1914- SHEET 1.

2 SHEETS Patented June 29 THE NORRIS PETERS 60.. PHOTO-LITHQ.WASHINGTON. D. c.

W. A. AUSTIN & S. S. LAWSON. SCREW REVERSE GEAR FOR ENGINE VALVES.

APPLICAHON FILED DEC-1.. 914' 1,144,455. Patented June 29, 1915.

2 SHEETSSHEET Z.

Nkg 0 THE NORRIS PETERS c0 PHOTG-LITHO., WASHINGTON O C.

s a rs OFFER.

WILLIAM A. AUSTIN AND SHERMAN S. LAWSON, OF LIMA, OHIO, ASSIGNORS T0LIMA LOCOMOTIVE CORPORATION, OF LIMA, OHIO, A CORPORATION OF VIRGINIA.

SCREW REVERSE-GEAR FOR ENGINE VALVES Specification of Letters Patent.

Patented June 29, M115.

Application filed December 1, 1914. Serial No. 874,967.

To all whom it may concern Be it known that we, WILLIAM A. AUSTIN andSHERMAN S. LAWSON, both citizens of the United States, the said WILLIAMA. AUSTIN residing at 415 South Cole street, Lima, county of Allen, andState of Ohlo, and the said SHERMAN S. LAwsoN residing at 858 WestMarket street, Lima, county of Allen, and State of Ohio, have inventedcertain new and useful Improvements in Screw Reverse-Gear forEngine-Valves, fully described and represented in the followingspecification and the accompanylng drawings, forming a part of the same.

The present invention relates to certain improvements in a valvereverse-gear operated by a manually-rotated operating screw.

The invention may be applied forreyersing the valve in any engineprovided with a valve-reversing link, but the apparatus is shown mountedupon abracket of construction especially fitted for attachment to thefire-box of a locomotive. In this class of valve reverse-gear it iscommon to mount one end of the screw in a stationary bearing and topropel a nut by the manual rotation of the screw, the nut beingconnected with the reach-rod for shifting the reverse links of theengine valve-gear, and the object of the present invention is to improvethe engagement of the screw with the reachrod in such a manner that thecrosshead which connects the screw-nut with the reachrod may be removedfrom the other parts for repairs without disturbing the crosshead-guideor the screw, and also in such manner that the crosshead may beconnected with the reach-rod clevis by a yoke so engaged with thecrosshead that the yoke and reach-rod can be removed without disturbingeither the crosshead, the crossheadguide, or the screw. Suchimprovements greatly facilitate the disconnection of the parts whenrepairs are necessary and also their subsequent re-assembling. These objcots are attained in the first respect, by providing only a singlecrosshead-guide disposed wholly at one side of the screw, with acrosshead having separable parts fitted to opposite sides of such guideand screw, and engaged detachably with a nut upon the screw, by whichmeans the parts of the crosshead can be separated and removed from theguide and nut without disturbing any of the other parts. In the secondrespect, by connecting the crosshead with the clevis of the reach-rod bya yoke formed of two yoke-pieces engaged detachably with opposite sidesof the crosshead, and eX- tended beyond the end of the screw intoconnection with the clevis. Such yokepieces are held together upon thecrosshead by their connection with the clevis and by a cross-tie whichis arranged at one side of the screw so as to clear the same.

In the annexed drawing, Figure 1 is a side elevation of the reverse-gearwith a diagrammatic representation of the rock-shaft for controlling thetwo reverse-links in a locomotive valve-gear,- Fig. 2 is a plan of thereverse-gear with the reach-rod attached to theyoke of said gear; Fig. 3is an elevation of the bearings for the screw and handwheel; Fig. 4: isa section on line i I in Fig. 3; Fig. 5 is a section of the crosshead online 55 in Fig. 1; and Fig. 6 is a section of the crosshead on line 6-6in Fig. 1. Fig. 7 is a section on line 7-7 in Fig. 1.

A designates the side of the firebox, upon which a bed-piece B ispermanently secured to receive the foot 0 of the bracket, which issecured detachably to such bed-piece by the bolts D. The bracket extendshorizontally and has two transverse arms, the arm E extending across thecenter line of the screw and forming a bearing for the journal of thescrew F, and having a lug E projected from the top of the arm over theaxis of the screw. The arm G at the opposite end of the bracket does notcross the center of the screw like the arm E but is extended upwardly atone side of the same and has a lug G extended over the axis of thescrew, so that the lugs E and Ur may support a single guide-bar H whichforms the sole guide for the crosshead, wholly at one side of the screw.The screw has a cog-wheel aupon its end outside of the bearing E, and asimilar wheel I) is meshed with the same and journaled on an adjacentshaft I in a hearing I at one side of the bearing E. The shaft of thecog-wheel b is provided with the handwheel 0 which thus operates torotate the screw when the handwheel is turned. The use of thesecogwheels locates the hand wheel in a more convenient relation to theposition of the engineer in a locomotive cab. Thescrew is provided witha movable nut d having studs 6 upon its opposite sides, and

have holes 0 fitted to receive the studs, andare also provided withadjacent trunnions g to connect with the reach-rod h. Thecrosshead-plates f are wholly separable from one another and from theguide-bar H and are connected by transverse bolts 2' and packingblocks jextending between the plates at the upper and lower sides of theguide-bar.

Fig. 6 shows the blocks formed integral with the plate-s 7, but Fig. 5shows them separate and rabbeted to the inner sides of the plates, whichserves to hold plates rigidly in alinement. The removal of the boltsipermits the crosshead to be wholly sepa' rated from the guide-bar andfrom the nut dwithout unfastening the guide-bar or removing the screw ornut from their working positions.

The arm 9 upon the bracket is set far enough at one side of the screw toclear a yoke which connects the crosshead with the reach-rod, and isformed of two yoke-pieces or side-parts having journal-holes g to fitthe trunnions 9 upon the crosshead, and at the other end are bolted toopposite sides of the reach-rod clevis Z. The side-parts are formed offlat bars spaced far enough apart to clear the sides of the screw, andare connected together below the level of the screw by lugs m and boltsan extended through the same and a spacing-block n.

In Fig. 2, the rear end of the reach-rod h is shown screwed into theclevis Z and locked by jam-nuts Z and the forward end of the reach-rodis shown screwed into a fork 0 and locked therein by nut 0.

In Fig. 1, the fork 0 of the reach-rod is shown journaled to a crank 79upon a rockshaft 9, upon which, in practice, crankss are fastened tomove the links of the valve gear. The clevis has a collared sleeve Zswiveled in its forward end, and threaded internally to fit the rear endof the reachrod.

The head Z of the sleeve is fitted to re ccive a wrench, and the sleevemay thus be turned to adjust the reach-rod. This construction. avoidsthe disconnection of the fork 0 from the crank 72 to adjust it, or therotating of the reach-rod, the offset 72. of of which interferes withits rotation.

The ends of the side-parts 70 rock slightly upon the trunnions g inmoving the crank 79 back and forth over the rock-shaft 1, and theirjournals 9 fit detachably upon the trunnions so that they can be freelyseparated therefrom by merely removing the bolts m which tie theside-parts together, and then springing them apart to clear thetrunnions. This can be effected without disturbing the screw,thecrosshead", or its guide-bar H. In like manner, the removal of thebolts 6 permits the free detachment of the crosshead-parts fromtheguide-bar H, as the side-plates of the crosshead slip freely from thestuds 6 when the plates are removed from the guide-bar.

The crosshead is shown provided with gibs r fitted between thepacking-blocks j and the upper and lower sides of the guidebar H, andsuch gibs can be removed and renewed, or the crosshead repaired in anyother manner without disturbing the guidebar, the screw, or its nut.

It will; be observed that the lugs E and G, support the crosshead-guideH, parallel with. the. screw S, but that the arms E and Gr whichcarrying those lugs are not in line with1 one another, asthe arm '15crosses the axis of the screw, while,the arm G lies at a considerabledistance to one side of the same, to permit the free passage of theyoke, during the movements of; theireach -rod.

The screw is provided, upon opposite sides of its bearing, withanti-friction thrust-collars. t which may be made with balls or; rollsto reduce the; friction, or of any other approved construction.

The gear wis counterbored upon its outer side, and; a small collar orhead a upon the end of the screw is fitted to the counterbore, so thatthe head ct resists the pull upon the screw when it drawsthe nut. towardthe bearing E.

The thrust upon the screw when moving the nut in the opposite directionis sustained by one of the anti-frictioncolla-rs and by ing E, is alittle, larger than the thread, of

the screw F, so that the latter (with the cog-wheel a fitted against thehead a) may be passed through the bearing from the outer end of thesame, before the inner thrust-collar and the jam-nuts u are applied. Thestrain upon the screw is thus amply supported, while the jam-nuts can beadjusted to prevent lost motion.

This reverse-gear is formed with relatively few parts, and of simpleconstruction, and affords the advantages specified above in respect tothe separation of certain parts from others without dismantling theapparatus.

A casing 42 is shown inclosing the cogwheels (1; and b, and a;latch-lever w is Heretofore, a special notched disk has been requiredupon the screw-shank to operate with such a latch; but; in ourconstruction guide-bar extended by the side of the screw,

the latch engages the cog-wheel a, and the need of a special notcheddisk is thus avoided. 1

, Having thus set forth-the nature of the invention what is claimedherein is:

1. In a valve reverse-gear, the combination,"with' an operating screwand a handwheel for rotating the same, of a single suitable means forconnecting the said parts operatively together, a nut upon the screw, acrosshead having separable parts fitted detachably upon the guide-barand connected to the nut, and a yoke j ournaled detachably upon oppositesides of the crosshead, with a clevis connected detachably to the yokefor connection to a reach-rod, whereby the crosshead may bedetached'from the guide-bar and nut without disturbing the screw, nut orguide-bar, and the yoke of the reach-rod may be detached from thevcros'sheadwithout disturbing the operative connection of the crosshead,the nut and the guide-bar.

2. In a valve reverse-gear, the combination, with an operating screw,and a hand-wheel for rotating the same, of a bracket having a bearingfor the screw adjacent to the handwheel, andarms upon opposite ends ofthe bracket extended transverse to the screw, a

bar attached to the arms forming a single crosshead-guide wholly at oneside of the screw, a crosshead supported wholly upon such singleguide-bar and having a nut fitted to the screw, and a reach-rodconnected to the crosshead.

3. In a valve reverse-gear, the combination, with a bracket havinga'bearing at one end with an operating screw journaled therein and meansfor rotating the same by hand, of a single bar sustained upon thebracket at one side of the screw to form a crosshead-guide, a crossheadhaving separable parts fitted detachably to opposite sides of theguide-bar and screw, a nut fixed in the crosshead and fitted to the saidscrew, and a reach-rod connected to the crosshead.

4:- In a valve reverse-gear, the combination, with an operating screwand a handwheel for rotating the same, of a single guide-bar extended byone side of the screw, a crosshead having separable parts secureddetachably upon the guide-bar, a nut upon the screw with freelydetachable connection to the parts of the crosshead, and a reachrodhaving a yoke extended at opposite sides of the screw and havingdetachable trunnion-connection with the outer sides of the crosshead.

5. In a valve reversegear, the combination, with a bracket having abearing at one end with an operating screw journaled therein and meansfor rotating the same by hand, of a single bar sustained upon thebracket at one side of the screw to form a crosshead-guide, a crossheadhaving separable parts fitted detachably to opposite sides of theguide-bar and screw, a nut fixed in the crosshead and fitted to the saidscrew, trunnions upon opposite sides of the crosshead, yoke-piecesjournaled upon such trunnions and connected together at one side of theline of the screw, and a clevis and reachrod attached to the said yoke.

6. In a valve reverse-gear, the combination, with a bracket having ahearing at one end with an operating screw journaled therein, and meansfor rotating the screw by hand,'of a single bar sustained upon thebracket at one side of the screw to form the sole crosshead-guide, a nutupon the screw with trunnions projected laterally therefrom, a crossheadhaving separable parts fitted detachably to the sides of the guidebarand to the said trunnions, and a reachrod connected to the saidcrossbar.

7. In a valve reverse-gear, the combination, with an operating screw anda handwheel for operating the same, of a bracket having a bearingadjacent to the handwheel with an arm projected upwardly therefrom andhaving a lug extended over the axis of the said screw, an arm at theopposite end of the bracket disposed at one side of the screw and havinga lug projected over the axis of the screw, a bar attached to the lugsupon the arms and forming the sole crosshead-guide, a crosshead fitteddetachably to the guide and having a nut fitted to the screw, and areach-rod connected to the said crosshead.

8. In a valve reverse-gear, the combination, with an operating screw anda handwheel for rotating the same, of a bracket having a bearingadjacent to the hand wheel with an arm projected upwardly therefrom andhaving a lug extended over the aXis of the said screw, an arm at theopposite end of the bracket disposed at one side of thescrew and havinga lug projected over the axis of the screw, a bar attached to the lugsupon the arms and forming the sole crosshead-guide, a crosshead havingseparable parts fitted detachably to opposite sides of the guide-bar andextended by the opposite sides of the screw, a nut fixed in thecrosshead and fitted to the said screw, and a reach-rod connected to thesaid crosshead.

9. In a Valve reverse-gear, the combination, with a bracket having ahearing at one end with an operating screw having an enlarged shankjournaled therein and provided upon the end with a head, of a cogwheelfitted to the shank in contact with such head, a shaft upon the bracketad jacent to the screw-bearing, a cog-wheel upon the shaft meshing withthat upon the screw-shank, a hand-wheel upon the shaft for turning thecog-wheels, and jam-nuts fitted to the screw-shank upon the inner sideof the bearing whereby the pull and; thrust upon. the screw are fullysupported, a nutand crosshead actuated by the; screw, and a reach-rodconnected to thecrosshead.

1 10. In a. valve reverse-gear, thecombina? tion, with an operatingscrew and, a, hand: wheel for rotating the same, of a single guide-barextended by one side of the screw, it crosshead' secured movably uponthe guide-bar and having a nut. fitted to the screw and trunnions uponits opposite outer side, a yoke having sides-parts extended at oppositesides of the screw with their. rear ends journaled. upon the trunnions,and a. clevis attached to their for-ward: ends and:

having a threaded sleeve swiveled thenein and, adapted for rotation in;the, clevis to engage and adjust a reach-rod,

11. In a valve reverse-gem, the-comb nation, with a; bracket, hayinghearing,- at one end with an cpenating. screw journaled therein and ahand wheel for rotating the Cppies of this patent my be obtained forscrew, of a single bar supported upon the." bnacket. atfone side oftheiscrew to form a crosshead-guide, a crosshead having; separable.parts fitted detachably to opposite sides of theguidefbar and? screw, anut fixed in. the crosshead and fitted to the said screw, trunnionsuponi opposite sides of the crosshead, a yoke having" side-parts withtheir, rear ends ournaledqupon the trunnions, and-a1 clevis secured tothe other ends of the yoke-pieces and having-a threaded sleeveswiveledgtherein and adapted for r0- tation. in thei-clevistoengage and adjust areach-rod; 1

Izn testimony wheneof we have hereunto I5. GREEN, CHAS. F. REYNOLDS.

five eents each, by addyewingthd"G'qmn issipner of Patents, Washington,D. 6. i

